field=models.ForeignKey(blank=True,null=True,on_delete=django.db.models.deletion.CASCADE,related_name='break_after',to='chronos.TimePeriod',verbose_name='Effective start of break'),
),
migrations.AddField(
model_name='break',
name='before_period',
field=models.ForeignKey(blank=True,null=True,on_delete=django.db.models.deletion.CASCADE,related_name='break_before',to='chronos.TimePeriod',verbose_name='Effective end of break'),